Does the issue only occur on Netflix or across other channels installed on your Roku as well? If it only happens when accessing Netflix, you can remove then re-install the channel. Make sure to restart your TV before adding it back in to ensure the process is successful.
Remove the channel: Highlight the channel tile on your home screen and press the Star button to open the options menu. Select Remove channel and confirm.
Restart your Roku device: If it is inconvenient to reach the power cord to unplug your Roku device, you can restart the device from the settings menu. Go to Settings > System > Power > System restart > Restart on a Roku TV.
Re-install the channel: After your Roku device restarts, visit the Roku Channel Store and add the channel again.
I’ve been having this issue as well on a TCL 4 series Roku tv. Netflix is the ONLY app that causes this freezing and locking up of the tv. I’ve tried uninstalling the app restarting the tv and then reinstalling with no luck. I don’t have this issue on any other Roku device. This is very frustrating because I can only scroll though Netflix for about 1 minute before everything freezes.
Thanks for letting us know about the issue you're experiencing.
Channels on Roku are maintained by the channel developer themselves. We suggest reaching out to Netflix Support to report the issue and get help. There's likely an issue within that specific channel that needs to be addressed with an update from the channel developer.
Could you specify to us the channels where you are experiencing the issue? Have you tried the troubleshooting I provided above on one of the affected channels? If not, we recommend giving it a shot then let us know if there's any difference after.